重组竹剪切应力—应变关系及强度特征值提取  

Shear Stress of Bamboo Scrimber-Strain Relationship and Extraction of Strength Characteristic Values

作　　者：江凤娇 邵文哲 盛叶 张峰 吴志鸿 JIANG Feng-jiao;SHAO Wen-zhe;SHENG Ye;ZHANG Feng;WU Zhi-hong(College of Transportation and Civil Engineering,Fujian Agriculture and Forestry University,Fuzhou 350100,Fujian,China;CSCEC Strait Construction and Development Co.,Ltd.,Fuzhou 350000,Fujian,China)

机构地区：[1]福建农林大学交通与土木工程学院,福建福州350100 [2]中建海峡建设发展有限公司,福建福州350000

出　　处：《竹子学报》2023年第2期23-30,共8页Journal of Bamboo Research

基　　金：福建省科技厅自然科学基金面上项目(2020J01579);福建省林业科技项目(闽林科[2020]29号);中建股份科技研发项目(CSCEC-2022-Z-58)。

摘　　要：【目的】为了解重组竹的受剪性能并安全高效地应用于结构设计。【方法】对3组不同工况下的重组竹标准小试件进行剪切试验,研究重组竹横纹、顺纹及面内剪切力学性能和应力—应变关系。【结果】重组竹横纹剪切强度最高,平均值为15.49 MPa,约是顺纹剪切强度的2.1倍、面内剪切强度的2.7倍。依据破坏模态对试件进行分类,提出相应的应力—应变表达式,计算曲线与试验曲线拟合较好。【结论】采用参数法和非参数法对试验值进行统计分析,基于试验值计算累积分布函数下5%分位值和75%置信度水平下5%分位值的参数法容许极限(PTL),认为最优概率分布下的PTL能较好体现重组竹受剪力学特征。【Objective】In order to comprehend the shear performance of bamboo scrimber and apply it to structure design safely and efficiently.【Method】Shear tests on three groups of small specimens of bamboo scrimber under different working conditions were carried out in this study,so as to study the mechanical properties and stress—strain relationship of the strength perpendicular to grain,parallel to grain and in plane shears of bamboo scrimber.【Result】The results showed that bamboo scrimber had the highest shear strength perpendicular to grain,the average value was 15.49 MPa,which was around 2.1 times that of shear parallel to grain strength and 2.7 times that of shear in plane.The specimens were classified according to the failure modes,and the relevant stress—strain expression was proposed.The calculation curve fit well with the test curve.【Conclusion】The test results were statistically analyzed by using both parametric and non-parametric methods.Based on the test values,the 5%quartile value and the parameter method tolerance limit(PTL)under the 75%confidence level were calculated,and the PTL is considered to better reflect the shearing mechanical characteristics of bamboo scrimber.

关 键 词：重组竹 剪切性能 破坏模态 应力—应变关系 特征值 

分 类 号：TU366.1[建筑科学—结构工程]